Dear libcg developers,
it looked like you have some interesting new additions in the latest code, but
I found when building from the latest git source cgconfigparser segfaults when
/etc/cgconfig.conf is not empty. The PKGBUILD is adapted from the AUR package
to build a -git package in Artix using OpenRC. Here are my build details in
case it is only my error!
$ cat PKGBUILD
pkgname=libcgroup-git
pkgver=r920.62f7665
pkgrel=1
pkgdesc='Library that abstracts the control group file system in Linux - GIT
version'
arch=('i686' 'x86_64')
url='http://libcg.sourceforge.net <http://libcg.sourceforge.net>'
license=(LGPL)
makedepends=('git')
backup=('etc/cgconfig.conf'
'etc/cgrules.conf'
'etc/cgsnapshot_blacklist.conf')
options=('!emptydirs' '!libtool')
install=libcgroup.install
source=("git://git.code.sf.net/p/libcg/libcg
<http://git.code.sf.net/p/libcg/libcg>")
md5sums=('SKIP')
pkgver() {
cd "$srcdir/libcg"
printf "r%s.%s" "$(git rev-list --count HEAD)" "$(git rev-parse --short
HEAD)"
}
build() {
cd "${srcdir}/libcg"
autoreconf -i
./configure \
--prefix=/usr \
--sysconfdir=/etc \
--localstatedir=/var \
--sbindir=/usr/bin \
--enable-opaque-hierarchy=name=openrc
make
}
package() {
cd "${srcdir}/libcg"
make DESTDIR="${pkgdir}" pkgconfigdir="/usr/lib/pkgconfig" install
install -D -m0644 samples/cgconfig.conf "${pkgdir}/etc/cgconfig.conf"
install -D -m0644 samples/cgrules.conf "${pkgdir}/etc/cgrules.conf"
install -D -m0644 samples/cgsnapshot_blacklist.conf
"${pkgdir}/etc/cgsnapshot_blacklist.conf"
rm -f ${pkgdir}/usr/lib/security/pam_cgroup.{la,so,so.0}
mv ${pkgdir}/usr/lib/security/pam_cgroup.so.0.0.0
${pkgdir}/usr/lib/security/pam_cgroup.so
rm -rf ${pkgdir}/etc/rc.d
# Make cgexec setgid cgred
chown root:160 ${pkgdir}/usr/bin/cgexec
chmod 2755 ${pkgdir}/usr/bin/cgexec
}
$ cat libcgroup.install
post_install() {
getent group cgred &>/dev/null || groupadd -r -g 160 cgred >/dev/null
}
post_upgrade() {
post_install
}
post_remove() {
getent group cgred &>/dev/null && groupdel cgred >/dev/null
}
$ gcc --version
gcc (GCC) 9.1.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
makepkg.conf altered for debug build:
#OPTIONS=(strip docs !libtool !staticlibs emptydirs zipman purge !debug)
OPTIONS=(!strip docs !libtool !staticlibs emptydirs zipman purge debug)
cgconfig.conf taken from man page example:
mount {
cpu = /mnt/cgroups/cpu;
cpuacct = /mnt/cgroups/cpuacct;
}
group daemons {
cpuacct{
}
cpu {
}
}
$ sudo /usr/bin/cgconfigparser -l /etc/cgconfig.conf
Segmentation fault
$ sudo gdb --args /usr/bin/cgconfigparser -l /etc/cgconfig.conf
GNU gdb (GDB) 8.3
Copyright (C) 2019 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html
<http://gnu.org/licenses/gpl.html>>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
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Type "show configuration" for configuration details.
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<http://www.gnu.org/software/gdb/bugs/ <http://www.gnu.org/software/gdb/bugs/>>.
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Reading symbols from /usr/bin/cgconfigparser...
(gdb) run
Starting program: /usr/bin/cgconfigparser -l /etc/cgconfig.conf
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7ca0540 in __strncpy_ssse3 () from /usr/lib/libc.so.6
(gdb) bt
#0 0x00007ffff7ca0540 in __strncpy_ssse3 () from /usr/lib/libc.so.6
#1 0x00007ffff7d4479e in strncpy (__len=4095, __src=0x5555f8b0 <error: Cannot
access memory at address 0x5555f8b0>, __dest=<optimized out>)
at /usr/include/bits/string_fortified.h:106
#2 config_insert_cgroup (cg_name=0x5555f8b0 <error: Cannot access memory at
address 0x5555f8b0>, flag=flag@entry=0) at config.c:174
#3 0x00007ffff7d44808 in cgroup_config_insert_cgroup (cg_name=<optimized out>)
at config.c:193
#4 0x00007ffff7d3a9a5 in yyparse () at parse.y:106
#5 0x00007ffff7d445be in cgroup_parse_config (pathname=0x555555559280
"/etc/cgconfig.conf") at config.c:1083
#6 0x00007ffff7d452a9 in cgroup_config_load_config (pathname=<optimized out>)
at config.c:1127
#7 0x000055555555534c in main (argc=<optimized out>, argv=0x7fffffffe5c8) at
cgconfig.c:191
(gdb)
Trying again building with an older gcc-7 resulted in the same issue:
$ sudo gdb --args /usr/bin/cgconfigparser -l /etc/cgconfig.conf
...
Reading symbols from /usr/bin/cgconfigparser...
(gdb) run
Starting program: /usr/bin/cgconfigparser -l /etc/cgconfig.conf
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7ca0540 in __strncpy_ssse3 () from /usr/lib/libc.so.6
(gdb) bt
#0 0x00007ffff7ca0540 in __strncpy_ssse3 () from /usr/lib/libc.so.6
#1 0x00007ffff7d44648 in strncpy (__len=4095, __src=0x5555f8b0 <error: Cannot
access memory at address 0x5555f8b0>, __dest=<optimized out>)
at /usr/include/bits/string_fortified.h:106
#2 config_insert_cgroup (cg_name=0x5555f8b0 <error: Cannot access memory at
address 0x5555f8b0>, flag=flag@entry=0) at config.c:174
#3 0x00007ffff7d44728 in cgroup_config_insert_cgroup (cg_name=<optimized out>)
at config.c:193
#4 0x00007ffff7d3af2c in yyparse () at parse.y:106
#5 0x00007ffff7d4453e in cgroup_parse_config (pathname=0x555555559280
"/etc/cgconfig.conf") at config.c:1083
#6 0x00007ffff7d45189 in cgroup_config_load_config (pathname=<optimized out>)
at config.c:1127
#7 0x0000555555555394 in main (argc=<optimized out>, argv=0x7fffffffe5c8) at
cgconfig.c:191
(gdb)
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